The hashtag #foxnewsfacts was soon trending on Twitter, with users posting pictures of the Queen wearing a head scarf suggesting she was subject to strict Muslim dress code. Others tweeted that "ham" had been removed from the city's name to comply with Islam's dietary restrictions.

Emerson later apologized for his statement.

"My comments on Fox News about Birmingham were totally inaccurate. Birmingham, please accept my apology; I was wrong," he said.

About 5% of the population of England are Muslim. In Birmingham, the proportion of Muslims is about 20%, according to 2011 census data. About 50% of the city's inhabitants identify themselves as Christian.

Emerson is a frequent guest on Fox News. He worked for CNN between 1990 and 1993, and has been called to testify at a congressional hearing.

The Birmingham claims were Fox News' second gaffe in its coverage of the Paris attacks, after anchor Shannon Bream suggested skin color can help identify "typical bad guys."